The first thing ______my brother is going to do this afternoon is to write a letter.
We can never pay you back for your __________, your ___________ and gift of knowledge.
There are forty-eight ____________ doctors in this hospital.
-What's the __________ of the ticket? -It's about five hundred yuan.
-Before I enter the competition, I want to know the __________. -The winner can get a gold medal.
Many people are thinking of new ways to fight the pollution of the __________.